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# Transportatin Test #

Crash Rate Crashes per million entering vehicles at intersectins, crashes per hundred million vehicle miles on road sections
Emotion the time to consider the sign's meaning and make a decision
Human Factor the study of how human being function in their natural or constructed surroundings
Identification the time to read and understand the sign
perception the time it takes to see the sign
SSD the distance needed by a driver to bring his vehicle to a safe stop, given roadway grades, surface conditions, and operating speeds
TCD traffic control devices a sign or pavement marking that is used to regulate, warn or guid drivers as they operate their vehicles
volition the time to exicute a maneuver
HSIP Highway Safety Improvement Program
MUTCD Manual for Uniform Traffic Control Devices
NHTSA National Highway Traffic Safety Administration
Degree of Curvature The number of degrees subtended by an angle defined by 100 feet of centerline along a horizontal curve
Effective radius (Rv) Distance from the center of curve to the middle of the innermost lane
Geometric design The way in which highway designers try to fit the highway to the terrain wile maintaining design standards for safety and performance
Horizontal Curve circular curves of radius R
Middle ordinate (Ms) Distance from the chord connecting the VPT and VPC to the centerlind of the horizontal curve.
Passing sight Distance (PSD) the sight distance required when pulling out to pass another vehicle on a two-lane road
Radius of curve Distance from the center of a circular horizontal curve to the centerline of the curve
Superelevation (e) The banking of a curve
Superelevation Runoff Length of roadway needed to accomplish a change in outside lane cross slope from zero to full
Tangent Runout Length of roadway needed to accomplish a change in outside lane cross slope from normal rate to zero
Vertical curve parabolic in vertical alignment of highways
Accepted gap or lag gap or lag that the driver of a minor-street vehicle uses to move into the major street
Critical gap The minimum size gap that a paticular driver will accept
Cycle Length The time required for on complete sequence of signal indications
Dilemma Zone the decision to stop when the light turns yellow, or continue through an intersection
Fully actuated control intersection signals that rely on detectors on all approaches.
Gap time elapsed between the rear bumper of one vehicle and the front bumper of the following vehicle passing a given point.
Headway The time elapsed between the fron bumper of vehicle and the front bumper of the following vehicle passing a given point
Interval The part of a signal cycle during which signal indications do not change
Lag time elapsed between the arrival of a minor street vehicle ready to move into the major street and the arrival of the front bumper of the next vehicle in the major traffic stream
Offset The time difference between green cycles of 2 signalized intersections (not always consecutive)
Rejected gap or lag gap or lag that the driver of a minor street vehicle waiting to enter the major street does not accept
Saturation flow rate the number of vph that could enter the intersection if the signal were always green
Semi actuated control the signal on a main street will stay green until a vehicle is detected on a minor street
Signal Indication The illumination of a signal lens or equivalent device
Signal Phase The green, Yellow change,and red clearance intervals in a cycle that are assigned to an independent traffic movement or combination of movements
Signal Warrant Use threshold values to help a traffic engineer make decisions on the installation of traffic signal control
Time Space Diagrams (TSD) are scaled drawings that show trajectories of vehicles traveling downstream or upstream on a network
Flexible Pavement Usually composed of asphalt concrete, which flexes under load
International Roughness Index (IRI) Measure of roughness. ride based but a direct function of pavement distress
Pavement distresses visual observations or faults
Pavement Management System (PMS) is a set of tools or methods that assist decision makers in finding optimum strategies for providing and maintaining pavements in a serviceable condition over a given period of time.
Present serviceability Index (PSI) rating 0-5 used to quantify pavement quality-surrogat to PSR
Present Serviceability Rating (PSR) subjective rating of pavement smoothnes performed by a panel of trained raters. scale 0-5 5 is the best
Rideability comfort of the rider
Rigid Pavement usually composed of Partland Cement concrete, distributes load evenly over base that acts like a spring
Structural Number (SN) reflects total pavement thickness
Terminal Serviceability Index (TSI) unacceptable level of ride quality (2-2.5
HERS-ST Highway economic requirements system-state version
HPMS highway performance monitoring system
LTPP long term performance pavement program
SHRP strategic Highway research program
TRB transportation research board
Created by: 525517839

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